CN210595617U - Processing system of chemistry nickel waste water - Google Patents
Processing system of chemistry nickel waste water Download PDFInfo
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- CN210595617U CN210595617U CN201921416582.6U CN201921416582U CN210595617U CN 210595617 U CN210595617 U CN 210595617U CN 201921416582 U CN201921416582 U CN 201921416582U CN 210595617 U CN210595617 U CN 210595617U
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Abstract
The utility model relates to a chemical nickel waste liquid purifies administers technical field, concretely relates to processing system of chemical nickel waste water, including the abandonment mother liquor preprocessing device and the mixed waste liquid purifier that communicate in proper order, abandonment mother liquor preprocessing device is including the nickel removal electrolysis trough, the nickel removal reaction eduction tank, the nickel removal pressure filter, the phosphorus removal reaction eduction tank and the phosphorus removal pressure filter that communicate in proper order, the liquid outlet of removing the nickel pressure filter communicates with the inlet of phosphorus removal reaction eduction tank; mix waste liquid purifier including the waste liquid collecting pit, pH equalizing basin, sand filtration jar, the nickel removal chelate resin jar that communicate in proper order, dephosphorization reaction precipitation tank and dephosphorization sedimentation tank, the liquid outlet of dephosphorization pressure filter communicates with the inlet of waste liquid collecting pit. The set of treatment system not only aims at the purification treatment of the chemical nickel waste mother liquor and the chemical nickel plating cleaning wastewater, but also provides favorable conditions for classified recovery of nickel resources and phosphorus resources, and saves the treatment cost.
Description
Technical Field
The utility model relates to a chemical nickel waste liquid purifies administers technical field, concretely relates to processing system of chemical nickel waste water.
Background
Chemical nickel waste water mainly divide into chemical nickel abandonment mother liquor and chemical nickel plating washing wastewater, and current chemical nickel waste water treatment mainly focuses on the processing of chemical nickel plating washing wastewater, and is not good to the treatment effect of chemical nickel abandonment mother liquor, mixes chemical nickel abandonment mother liquor and chemical nickel plating washing wastewater and handles and finally leads to the whole total nickel of water and total phosphorus to obtain shortcomings such as stable guarantee. In the prior art, a complete process flow cannot be formed aiming at chemical nickel wastewater discharged by chemical nickel plating, an enterprise needs to dispose part of high-concentration chemical nickel waste mother liquor while disposing part of cleaning wastewater, and high disposal cost brings great economic pressure to the enterprise.
In addition, the existing chemical nickel wastewater treatment technology is not clear in classification of the sludge after treatment, and is not beneficial to subsequent resource utilization.
Disclosure of Invention
In order to overcome the defects and deficiencies in the prior art, the utility model aims to provide a treatment system for treating chemical nickel wastewater by classification and classified recovery.
The purpose of the utility model is realized through the following technical scheme: a treatment system for chemical nickel wastewater comprises a waste mother liquor pretreatment device and a mixed waste liquor purification device which are sequentially communicated, wherein the waste mother liquor pretreatment device comprises a nickel removal electrolytic tank, a nickel removal reaction precipitation tank, a nickel removal filter press, a phosphorus removal reaction precipitation tank and a phosphorus removal filter press which are sequentially communicated, and a liquid outlet of the nickel removal filter press is communicated with a liquid inlet of the phosphorus removal reaction precipitation tank; mix waste liquid purifier including the waste liquid collecting pit, pH equalizing basin, sand filtration jar, the nickel removal chelate resin jar that communicate in proper order, dephosphorization reaction precipitation tank and dephosphorization sedimentation tank, the liquid outlet of dephosphorization pressure filter communicates with the inlet of waste liquid collecting pit.
Preferably, the waste mother liquor pretreatment device further comprises a chemical nickel mother liquor collecting tank, and a liquid outlet of the chemical nickel mother liquor collecting tank is communicated with a liquid inlet of the nickel removal electrolytic tank; the nickel removing filter press is a stacked spiral filter press, and the phosphorus removing filter press is a plate-and-frame filter press.
Preferably, the treatment system further comprises flushing means for flushing the sand filter tank.
Preferably, the sand filter tank is provided with a flushing inlet and a flushing outlet; the flushing device comprises a water inlet pipe communicated with a flushing inlet of the sand filter tank and a water inlet control valve arranged on the water inlet pipe; the device comprises a sand filter tank, a pH adjusting tank, a phosphorus removal reaction eduction tank, a pH adjusting tank, a sand filter tank, a first waste liquid control tank, a second waste liquid control tank and a nickel removal chelate resin tank, wherein a flushing outlet of the sand filter tank is communicated with a water inlet of the phosphorus removal reaction eduction tank, a flushing waste water control valve is arranged between the sand filter tank and the phosphorus removal reaction eduction tank, a first waste liquid control valve is arranged between the pH adjusting tank and the sand filter tank, and a second waste.
Preferably, the nickel-removing chelate resin tank is provided with a regeneration liquid inlet and a regeneration liquid outlet; the treatment system also comprises a resin regeneration device communicated with the regeneration liquid inlet of the nickel-removing chelate resin tank and a regeneration waste liquid recovery device communicated with the regeneration liquid outlet of the nickel-removing chelate resin tank.
Preferably, the resin regeneration device comprises a regeneration liquid inlet pipe communicated with a regeneration liquid inlet of the nickel-removing chelate resin tank and a regeneration liquid control valve arranged on the regeneration liquid inlet pipe; remove and be provided with regeneration waste liquid control valve between nickel chelate resin jar and the regeneration waste liquid recovery unit, sand filtration jar with remove and be provided with first waste liquid operating valve between the nickel chelate resin jar, remove and be provided with second waste liquid operating valve between nickel chelate resin jar and the dephosphorization reaction precipitation pond.
Preferably, regeneration waste liquid recovery unit is including the regeneration waste liquid storage tank that communicates in proper order, remove the nickel reaction and separate out the pond and remove the nickel sedimentation tank, regeneration waste liquid control valve sets up in removing between nickel chelate resin jar and the regeneration waste liquid storage tank, remove the liquid outlet of nickel sedimentation tank with the inlet intercommunication of waste liquid collecting tank.
The beneficial effects of the utility model reside in that: the utility model discloses a processing system of chemical nickel waste water, this set of processing system had both been directed against chemical nickel abandonment mother liquor and chemical nickel plating cleaning wastewater purification treatment, can be for categorised recovery nickel resource and phosphorus resource provide the advantage again, can handle all chemical nickel abandonment mother liquors and the chemical nickel plating cleaning wastewater that chemical nickel plating process discharged, solved the enterprise and still need the problem of handling partial high concentration's chemical nickel abandonment mother liquor outsourcing simultaneously, sparingly administer the cost.
The utility model discloses a processing system, adopt abandonment mother liquor preprocessing device earlier to chemical nickel abandonment mother liquor preliminary treatment, detach a large amount of nickel ions and phosphorus ion and categorised recovery in the chemical nickel abandonment mother liquor, the concentration of nickel and phosphorus in the greatly reduced chemical nickel abandonment mother liquor, mix chemical nickel abandonment mother liquor and chemical nickel plating cleaning wastewater and adopt mixed waste liquid purifier to further detach the lower mixed waste liquid of nickel ion concentration and phosphorus ion concentration and categorised recovery, the processing load who mixes waste liquid purifier has been alleviateed, the steady operation of a whole set of processing system has been ensured.
When the chemical nickel waste mother liquor is used, the chemical nickel waste mother liquor flows into a nickel removal electrolytic tank for electrolysis and is replaced with a nickel simple substance, a nickel removal reaction precipitation tank further reacts nickel in the chemical nickel waste mother liquor into solid and precipitates, the chemical nickel waste mother liquor containing nickel solid is treated by a nickel removal filter press to separate nickel solid from the chemical nickel waste mother liquor, so that the nickel concentration of the chemical nickel waste mother liquor is greatly reduced, and high-purity nickel solid is separated so as to be convenient for classification and recovery; the chemical nickel waste mother liquor with separated nickel reacts in the phosphorus removal reaction precipitation tank and precipitates phosphorus-containing solid, the chemical nickel waste mother liquor with the phosphorus-containing solid separates the phosphorus-containing solid from the chemical nickel waste mother liquor through the phosphorus removal filter press, so that the phosphorus concentration of the chemical nickel waste mother liquor is greatly reduced, high-purity phosphorus-containing solid is separated so as to be convenient for classified recovery, the chemical nickel waste mother liquor with separated phosphorus enters the waste liquor collection tank and is mixed with chemical nickel plating cleaning wastewater, mixed waste liquor is uniformly mixed, the mixed waste liquor purification device is enabled to run more stably, and the treatment load of the mixed waste liquor purification device is reduced. The mixed waste liquid in the waste liquid collecting tank enters a pH adjusting tank to adjust the pH value to 6.00-7.00, and then the particles in the mixed waste liquid are filtered by a sand filter tank, so that the particles are prevented from entering a nickel removal chelating resin tank to cause blockage and hardening, the workload of the nickel removal chelating resin tank is reduced, and the cost of using chelating resin is greatly saved; the filtered mixed waste liquid enters a nickel removal chelating resin tank to be adsorbed with residual nickel ions, so that the mixed waste liquid meets the requirements of nickel discharge standards of workshops, and nickel resources are recovered by the nickel removal chelating resin tank; the mixed waste liquid after nickel removal is reacted in a phosphorus removal reaction separation tank to separate out phosphorus-containing solids, the mixed waste liquid of the phosphorus-containing solids is subjected to sedimentation separation on the phosphorus-containing solids and the mixed waste liquid in a phosphorus removal sedimentation tank, so that the mixed waste liquid meets the requirements of phosphorus discharge standards of workshops, and the high-purity phosphorus-containing solids are separated out to facilitate classification and recovery.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The reference signs are: 1. a nickel-removing electrolytic cell; 2. a nickel removal reaction precipitation tank; 3. a nickel removal filter press; 4. a phosphorus removal reaction precipitation tank; 5. a dephosphorization filter press; 6. a waste liquid collection tank; 7. a pH adjusting tank; 8. a sand filtration tank; 9. a nickel removal chelate resin tank; 10. a phosphorus removal reaction precipitation tank; 11. a dephosphorization sedimentation tank; 12. a chemical nickel mother liquor collecting tank; 13. a water inlet pipe; 14. a water inlet control valve; 15. a flushing waste water control valve; 16. a first waste liquid control valve; 17. a second waste liquid control valve; 18. a regenerated liquid inlet pipe; 19. a regeneration liquid control valve; 20. a regeneration waste liquid control valve; 21. a first waste liquid operated valve; 22. a second waste liquid operated valve; 23. a regeneration waste liquid storage tank; 24. a nickel removal reaction precipitation pool; 25. a nickel removal sedimentation tank.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and accompanying drawings, which are not intended to limit the present invention.
As shown in fig. 1, a treatment system for chemical nickel wastewater comprises a waste mother liquor pretreatment device and a mixed waste liquor purification device which are sequentially communicated, wherein the waste mother liquor pretreatment device comprises a nickel removal electrolytic tank 1, a nickel removal reaction precipitation tank 2, a nickel removal filter press 3, a phosphorus removal reaction precipitation tank 4 and a phosphorus removal filter press 5 which are sequentially communicated, and a liquid outlet of the nickel removal filter press 3 is communicated with a liquid inlet of the phosphorus removal reaction precipitation tank 4; mix waste liquid purifier including the waste liquid collecting pit 6, pH equalizing basin 7, the sand filtration jar 8 that communicate in proper order, remove nickel chelate resin jar 9, dephosphorization reaction and separate out pond 10 and dephosphorization sedimentation tank 11, the liquid outlet of dephosphorization pressure filter 5 and the inlet of waste liquid collecting pit 6 communicate.
The utility model discloses a processing system of chemical nickel waste water both had been directed against chemical nickel abandonment mother liquor and chemical nickel plating cleaning wastewater purification treatment, can provide the advantage for categorised recovery nickel resource and phosphorus resource again, can handle all chemical nickel abandonment mother liquors and the chemical nickel plating cleaning wastewater that chemical nickel plating process discharged, solved the enterprise and still need commission the problem of dealing with the chemical nickel abandonment mother liquor of part high concentration outward when dealing with part cleaning wastewater, sparingly administer the cost.
The utility model discloses a processing system, adopt abandonment mother liquor preprocessing device earlier to chemical nickel abandonment mother liquor preliminary treatment, detach a large amount of nickel ions and phosphorus ion and categorised recovery in the chemical nickel abandonment mother liquor, the concentration of nickel and phosphorus in the greatly reduced chemical nickel abandonment mother liquor, mix chemical nickel abandonment mother liquor and chemical nickel plating cleaning wastewater and adopt mixed waste liquid purifier to further detach the lower mixed waste liquid of nickel ion concentration and phosphorus ion concentration and categorised recovery, the processing load who mixes waste liquid purifier has been alleviateed, the steady operation of a whole set of processing system has been ensured.
When the chemical nickel waste mother liquor is used, the chemical nickel waste mother liquor flows into the nickel removal electrolytic tank 1 for electrolysis and nickel elementary substances are replaced, the nickel removal reaction precipitation tank 2 further reacts nickel in the chemical nickel waste mother liquor into solid and precipitates, the chemical nickel waste mother liquor containing nickel solid is treated by the nickel removal filter press 3 to separate nickel solid from the chemical nickel waste mother liquor, so that the nickel concentration of the chemical nickel waste mother liquor is greatly reduced, and high-purity nickel solid is separated so as to be convenient for classification and recovery; the chemical nickel waste mother liquor with separated nickel reacts through the phosphorus removal reaction precipitation tank 4 and precipitates phosphorus-containing solid, the chemical nickel waste mother liquor with the phosphorus-containing solid separates the phosphorus-containing solid from the chemical nickel waste mother liquor through the phosphorus removal filter press 5, so that the phosphorus concentration of the chemical nickel waste mother liquor is greatly reduced, high-purity phosphorus-containing solid is separated so as to be convenient for classified recovery, the chemical nickel waste mother liquor with separated phosphorus enters the waste liquor collection tank 6 and is mixed with chemical nickel plating cleaning wastewater, mixed waste liquor is uniformly mixed, the mixed waste liquor purification device is enabled to run more stably, and the treatment load of the mixed waste liquor purification device is reduced. The mixed waste liquid in the waste liquid collecting tank 6 enters a pH adjusting tank 7 to adjust the pH value to 6.00-7.00, and then the particles in the mixed waste liquid are filtered by a sand filter tank 8, so that the particles are prevented from entering a nickel removal chelating resin tank 9 to cause blockage and hardening, the workload of the nickel removal chelating resin tank 9 is reduced, and the cost of using chelating resin is greatly saved; the filtered mixed waste liquid enters a nickel removal chelating resin tank 9 to absorb residual nickel ions, so that the mixed waste liquid meets the requirements of nickel discharge standards of workshops, and nickel resources are recovered by the nickel removal chelating resin tank 9; the mixed waste liquid after nickel removal is reacted in a phosphorus removal reaction precipitation tank 10 to precipitate phosphorus-containing solids, the mixed waste liquid of the phosphorus-containing solids is subjected to sedimentation separation on the phosphorus-containing solids and the mixed waste liquid in a phosphorus removal precipitation tank 11, so that the mixed waste liquid meets the requirements of phosphorus discharge standards of workshops, and high-purity phosphorus-containing solids are separated to facilitate classification and recovery.
In this embodiment, the waste mother liquor pretreatment device further comprises a chemical nickel mother liquor collecting tank 12, and a liquid outlet of the chemical nickel mother liquor collecting tank 12 is communicated with a liquid inlet of the nickel-removing electrolytic tank 1; the nickel removing filter press 3 is a stacked spiral filter press, and the phosphorus removing filter press 5 is a plate-and-frame filter press.
Because the waste amount of the chemical nickel waste gas mother liquor is less but the concentration of nickel and phosphorus is higher, the technical scheme is adopted, the concentrated treatment is conveniently carried out after a large amount of chemical nickel waste gas mother liquor is collected, the treatment cost is saved, and the equipment loss is reduced. The nickel-removing filter press 3 adopts a stacked spiral filter press to separate nickel-containing sludge and waste chemical nickel mother liquor from waste chemical nickel mother liquor containing nickel solids, and concentrates and dehydrates the nickel-containing sludge to obtain a nickel-containing filter cake with high solid content, so that the waste chemical nickel mother liquor containing high-concentration phosphorus is prevented from being mixed into the nickel-containing filter cake to reduce the purity of the nickel-containing filter cake, and classification and recovery are facilitated; the dephosphorization filter press 5 adopts a plate-and-frame filter press to separate phosphorus-containing sludge and chemical nickel waste mother liquor from the chemical nickel waste mother liquor containing phosphorus solids, thereby greatly reducing the phosphorus concentration of the chemical nickel waste mother liquor and separating high-purity phosphorus-containing sludge for classification and recovery.
In this embodiment, the treatment system further comprises flushing means for flushing the sand filter tank 8.
Adopt above-mentioned technical scheme, adopt washing unit to wash sand filtration jar 8 avoids the particulate matter of 8 interceptions of sand filtration jar blocks up sand filtration jar 8 and has reduced sand filtration jar 8's treatment effeciency, guarantees sand filtration jar 8's normal operating, prevents that the particulate matter from getting into along with mixing the waste liquid and removing nickel chelate resin jar 9 and cause the jam and harden.
In this embodiment, the sand filter tank 8 is provided with a flushing inlet and a flushing outlet; the flushing device comprises a water inlet pipe 13 communicated with a flushing inlet of the sand filtering tank 8 and a water inlet control valve 14 arranged on the water inlet pipe 13; the flushing outlet of the sand filter tank 8 is communicated with the water inlet of the dephosphorization reaction precipitation tank 4, a flushing wastewater control valve 15 is arranged between the sand filter tank 8 and the dephosphorization reaction precipitation tank 4, a first wastewater control valve 16 is arranged between the pH adjusting tank 7 and the sand filter tank 8, and a second wastewater control valve 17 is arranged between the sand filter tank 8 and the nickel-removing chelate resin tank 9.
The particulate matters intercepted by the sand filter tank 8 are mainly phosphorus-containing solids which are not completely removed by the phosphorus removal filter press 5 and phosphorus-containing solids separated out in the pH adjusting tank 7, and by adopting the technical scheme, when the sand filter tank 8 needs to be washed, the first waste liquid control valve 16 and the second waste liquid control valve 17 are closed, the water inlet control valve 14 and the washing waste water control valve 15 are opened, so that washing water sequentially enters the sand filter tank 8 along the water inlet pipe 13 and the water flushing outlet of the sand filter tank 8 to be washed and generates washing waste water, and the washing waste water sequentially enters the phosphorus removal reaction and separation tank 4 along the water flushing outlet of the sand filter tank 8 and the water inlet of the phosphorus removal reaction and separation tank 4 to be further subjected to phosphorus removal treatment; after the washing is completed, the water inlet control valve 14 and the washing waste water control valve 15 are closed, the first waste liquid control valve 16 and the second waste liquid control valve 17 are opened, and the sand filtration tank 8 can continue to filter the mixed waste liquid. Further, in the sand filtering tank 8, the flow direction of the washing water is opposite to that of the mixed waste liquid, thereby achieving a washing effect.
In this embodiment, the nickel removal chelate resin tank 9 is provided with a regeneration liquid inlet and a regeneration liquid outlet; the treatment system also comprises a resin regeneration device communicated with the regeneration liquid inlet of the nickel-removing chelate resin tank 9 and a regeneration waste liquid recovery device communicated with the regeneration liquid outlet of the nickel-removing chelate resin tank 9.
By adopting the technical scheme, the resin regeneration device is adopted to regenerate the chelate resin in the nickel removal chelate resin tank 9 and replace nickel ions to generate regenerated waste liquid, the regenerated waste liquid enters the regenerated waste liquid recovery device to further remove and recover the nickel ions in the regenerated waste liquid so as to be classified and recovered, the nickel removal chelate resin tank 9 is prevented from adsorbing supersaturation of the nickel ions, the treatment efficiency of the nickel removal chelate resin tank 9 is reduced, the standard exceeding of nickel emission is caused, the normal operation of the nickel removal chelate resin tank 9 is ensured, and the nickel ions are prevented from entering the phosphorus removal reaction separation tank 10 along with the mixed waste liquid to cause the standard exceeding of nickel emission.
In this embodiment, the resin regeneration device includes a regeneration liquid inlet pipe 18 communicated with the regeneration liquid inlet of the nickel-removing chelate resin tank 9, and a regeneration liquid control valve 19 disposed in the regeneration liquid inlet pipe 18; remove and be provided with regeneration waste liquid control valve 20 between nickel chelate resin jar 9 and the regeneration waste liquid recovery unit, sand filtration jar 8 with remove and be provided with first waste liquid operating valve 21 between the nickel chelate resin jar 9, remove and be provided with second waste liquid operating valve 22 between nickel chelate resin jar 9 and the dephosphorization reaction precipitation pond 10.
By adopting the technical scheme, when the chelate resin of the nickel removal chelate resin tank 9 needs to be regenerated, the first waste liquid control valve 21 and the second waste liquid control valve 22 are closed, and the regenerated liquid control valve 19 and the regenerated waste liquid control valve 20 are opened, so that the chelate resin and the regenerated liquid act, the chelate resin adsorbing nickel ions is finally regenerated, the nickel ions are replaced from the chelate resin to generate regenerated waste liquid, and the regenerated waste liquid flows into the regenerated waste liquid recovery device for recovery; after the chelate resin regeneration treatment is completed, the regeneration liquid control valve 19 and the regeneration waste liquid control valve 20 are closed, the first waste liquid control valve 21 and the second waste liquid control valve 22 are opened, the nickel removal chelate resin tank 9 can continue to adsorb nickel in the mixed waste liquid, and the efficiency of nickel adsorption is ensured. The regeneration liquid is an existing material and is only used as an application.
In this embodiment, regeneration waste liquid recovery unit is including the regeneration waste liquid storage tank 23 that communicates in proper order, remove nickel reaction and separate out pond 24 and remove nickel sedimentation tank 25, regeneration waste liquid control valve 20 sets up and removes between nickel chelate resin jar 9 and the regeneration waste liquid storage tank 23, remove the liquid outlet of nickel sedimentation tank 25 with the inlet intercommunication of waste liquid collection pond 6.
By adopting the technical scheme, the regeneration waste liquid after the chelate resin regeneration treatment is intensively collected into the regeneration waste liquid storage tank 23, then reacts and separates out nickel-containing solids through the nickel-removing reaction separation tank 24, the regeneration waste liquid containing the nickel solids is settled and separated out nickel-containing sludge and regeneration waste liquid through the nickel-removing sedimentation tank 25, thereby greatly reducing the nickel concentration of the regeneration waste liquid, separating out high-purity nickel-containing sludge for classification and recovery, and mixing the regeneration waste liquid with separated nickel into the waste liquid collection tank 6 for circular treatment; the regeneration waste liquid recovery device avoids environmental pollution caused by the excessive discharge of the nickel content in the regeneration waste liquid due to the direct discharge of the regeneration waste liquid.
Specifically, the method for treating chemical nickel wastewater by using the treatment system of the utility model comprises the following steps:
(S) chemical nickel waste mother liquor pretreatment:
(S1) allowing the chemical nickel waste mother solution to flow into a nickel-removing electrolytic tank 1 for electrolytic treatment under the action of 400-550A current, and reducing nickel ions into nickel simple substances in the nickel-removing electrolytic tank 1 and adsorbing the nickel simple substances to a cathode plate of the nickel-removing electrolytic tank 1 so as to recover most of nickel in the chemical nickel waste mother solution;
(S2) feeding the chemical nickel waste mother liquor treated in the step (S1) into a nickel removal reaction precipitation tank 2, adjusting the pH value to 7.00-8.00, and adding Na2S, N can be effectively prevented under the environment of pH value of 7.00-8.00a2S reaction to H2S is overflowed, and the nickel ions in the chemical nickel waste mother liquor are quickly mixed with Na2Reacting S to generate NiS solid and separating out the NiS solid; then FeSO is added into the chemical nickel waste mother liquor4On the one hand Fe2+Can react with residual S2-Combined with precipitation, on the other hand, FeSO4The coagulation effect can be achieved, so that NiS suspended in the chemical nickel waste mother liquor forms flocculent precipitates, and the supernatant can be conveniently separated; adding PAM (polyacrylamide) into the chemical nickel waste mother liquor to form flocculated sludge, and sending the flocculated sludge into a nickel removal filter press 3 for sludge-water separation, so that the problems of dirt blockage and scaling of a treatment system can be effectively prevented, and nickel-containing sludge and chemical nickel waste mother liquor from which nickel is separated are obtained;
(S3) feeding the chemical nickel waste mother liquor with nickel separated in the step (S2) into a dephosphorization reaction precipitation tank 4 and adding H2SO4Adjusting the pH value to 6.00-7.00, and then adding FeSO4Fully dissolving, adding H2O2Of Fe2+Is oxidized into Fe3+，Fe3+Quickly reacts with phosphate radical in chemical nickel waste mother liquor with the reduction of the pH value of the system, and simultaneously uses NaOH to maintain the pH value to be 6.00-7.00 to generate FePO4Solid is separated out to form a mud-water mixture; then the mud-water mixture is sent into a dephosphorization filter press 5 for filter pressing, phosphorus-containing sludge and chemical nickel waste mother liquor with phosphorus separated are separated, and the recovery of FePO is effectively ensured4High purity and low heavy metal content;
(T) mixed waste liquid purification treatment:
(T1) mixing the chemical nickel plating cleaning wastewater with the chemical nickel waste mother liquor from which phosphorus is separated in the step (S3) in the waste liquor collecting tank 6 to obtain mixed waste liquor, wherein H remained in the chemical nickel waste mother liquor from which phosphorus is separated is firstly2O2And FeSO4Can react with hypophosphite in the chemical nickel plating cleaning wastewater to form FePO4On the other hand, the chemical nickel waste mother liquor and the chemical nickel plating cleaning wastewater are mixed to obtain homogenized mixed waste liquid, so that the subsequent treatment system can operate more stably;
(T2)、the mixed waste liquid of the step (T1) enters a pH adjusting tank 7 and uses H2SO4Adjusting pH to 6.00-7.00, filtering and intercepting FePO via sand filter tank 84The particles are prevented from blocking and hardening the nickel removal chelate resin tank 9; then the mixed waste liquid enters a nickel removal chelating resin tank 9 and absorbs the residual nickel in the mixed waste liquid, so that the nickel meets the requirements of nickel discharge standards of workshops;
(T3) feeding the mixed waste liquid after nickel removal in the step (T2) into a phosphorus removal reaction precipitation tank 10, and adding FeSO4、H2O2And the pH value of the system is maintained between 6.00 and 7.00, so that the hypophosphite and the Fe in the mixed waste liquid3+Reaction to form FePO4Precipitating, adding PAM for flocculation, flowing into a phosphorus removal sedimentation tank 11 for sedimentation and separation, so that the mixed waste liquid meets the requirements of the phosphorus discharge standard of a workshop, recovering the precipitated phosphorus-containing sludge as a phosphorus resource, and discharging the supernatant in the phosphorus removal sedimentation tank 11 out of the treatment system.
The processing method also comprises the following steps:
(A) and washing the sand filter tank 8: closing the first waste liquid control valve 16 and the second waste liquid control valve 17, opening the water inlet control valve 14 and the flushing waste water control valve 15, enabling flushing water to enter the sand filter tank 8 along the flushing water outlet of the sand filter tank 8 for flushing and generating flushing waste water, and enabling the flushing waste water to enter the phosphorus removal reaction precipitation tank 4 along the flushing water outlet of the sand filter tank 8 and the water inlet of the phosphorus removal reaction precipitation tank 4 in sequence for further phosphorus removal treatment.
The processing method also comprises the following steps:
(B) and (3) regenerating and treating the nickel-removing chelate resin tank 9 and treating regenerated waste liquid:
(B1) closing the first waste liquid control valve 21 and the second waste liquid control valve 22, and opening the regenerated liquid control valve 19 and the regenerated waste liquid control valve 20 to allow the chelate resin to react with the regenerated liquid and finally regenerate the chelate resin adsorbing nickel ions and displace the nickel ions from the chelate resin to generate regenerated waste liquids (i.e. acid regenerated waste liquid and waste liquid after alkali conversion);
(B2) the regeneration waste liquid in the step (B1) is collected into a regeneration waste liquid storage tank 23 and then enters a nickel removal reaction precipitation pool 24, and the P is regulated by NaOHH value is 10.00-12.00, and Ni in the regenerated waste liquid is reduced2+With OH-Reaction to form Ni (OH)2Solid is separated out; adding PAM into the regenerated waste liquid for flocculation, then entering a nickel removal sedimentation tank 25 for sedimentation and separation, recovering the precipitated nickel-containing sludge as a nickel resource, and returning the supernatant (namely the regenerated waste liquid from which nickel is separated) in the nickel removal sedimentation tank 25 to the waste liquid collection tank 6 for circular treatment.
The treatment method avoids the problems that a large amount of ammonia water serving as a pH buffering agent exists in waste chemical nickel mother liquor and chemical nickel plating cleaning wastewater, great difficulty is brought to the pH adjustment of subsequent purification treatment, a large amount of acid and alkali is consumed, meanwhile, ammonium ions in the waste chemical nickel mother liquor and the chemical nickel plating cleaning wastewater are converted into ammonia gas which overflows to an operation space, the operation environment is severe, and certain harm is caused to the health of operators. Avoids the prior chemical nickel wastewater treatment method from generally using FeSO4And H2O2The Fenton reaction is carried out under the condition that the pH value is 3.00-4.00, the duration is generally not less than 2 hours, and a large amount of NaOH is needed to adjust the pH value to 11.00 after the reaction, a large amount of acid and alkali is consumed, and a large amount of ammonium ions in the chemical nickel wastewater are converted into ammonia gas which is dissipated into the air to seriously affect the wastewater operating environment and bring great influence on waste gas treatment.
The treatment method uses FeSO4And H2O2Aim at generating Fe3+Using a large amount of Fe3+Binding with phosphate radical to form stable FePO4Precipitation, in other embodiments Fe may also be used directly3+The pH value of the system of the quasi-drug is maintained between 6.00 and 7.00, the condition is mild, compared with the existing Fenton reaction method, a large amount of acid and a large amount of alkali can be saved, and the problem of ammonia odor dissipation caused by overhigh pH value can be avoided while materials are saved.
The treatment method adopts a classified treatment mode to purify the chemical nickel waste water step by step and reasonably, not only aims at the purification treatment of the chemical nickel waste mother liquor and the chemical nickel plating cleaning waste water, but also provides favorable conditions for classified recovery of nickel resources and phosphorus resources, can treat all the chemical nickel waste mother liquor and the chemical nickel plating cleaning waste water discharged in the chemical nickel plating process, solves the problem that an enterprise needs to dispose part of the high-concentration chemical nickel waste mother liquor outside the enterprise while disposing part of the cleaning waste water, and saves the treatment cost.
The treatment method comprises the steps of pretreating the chemical nickel waste mother liquor, removing a large amount of nickel ions and phosphorus ions in the chemical nickel waste mother liquor, classifying and recycling the nickel ions and the phosphorus ions, greatly reducing the concentration of nickel and phosphorus in the chemical nickel waste mother liquor, mixing the chemical nickel waste mother liquor with the chemical nickel plating cleaning wastewater, further removing mixed waste liquor with lower nickel ion concentration and lower phosphorus ion concentration, classifying and recycling the mixed waste liquor, reducing the treatment load of a mixed waste liquor purification device, and ensuring the stable operation of the whole treatment system.
The present processing method uses S2-And Ni2+The NiS precipitate is generated in a combined way, and because the NiS precipitate is relatively stable, the pH value is controlled to be 7.00-8.00 in the step for safety consideration, so that H is avoided2And S overflows, the nickel content in the waste mother liquor treated by the nickel removal filter press 3 is reduced to be within 10mg/L, the nickel concentration in the waste mother liquor is reduced, the operation load of the nickel removal chelate resin tank 9 is lightened, and the regeneration period of the nickel removal chelate resin tank 9 is prolonged.
The above-mentioned embodiment is the utility model discloses the implementation of preferred, in addition, the utility model discloses can also realize by other modes, not deviating from the utility model discloses any obvious replacement is all within the protection scope under the prerequisite of design.
Claims (7)
1. The utility model provides a processing system of chemistry nickel waste water which characterized in that: the mixed waste liquor treatment device comprises a waste mother liquor pretreatment device and a mixed waste liquor purification device which are sequentially communicated, wherein the waste mother liquor pretreatment device comprises a nickel removal electrolytic tank, a nickel removal reaction precipitation tank, a nickel removal filter press, a phosphorus removal reaction precipitation tank and a phosphorus removal filter press which are sequentially communicated, and a liquid outlet of the nickel removal filter press is communicated with a liquid inlet of the phosphorus removal reaction precipitation tank; mix waste liquid purifier including the waste liquid collecting pit, pH equalizing basin, sand filtration jar, the nickel removal chelate resin jar that communicate in proper order, dephosphorization reaction precipitation tank and dephosphorization sedimentation tank, the liquid outlet of dephosphorization pressure filter communicates with the inlet of waste liquid collecting pit.
2. The chemical nickel wastewater treatment system according to claim 1, characterized in that: the waste mother liquor pretreatment device also comprises a chemical nickel mother liquor collecting tank, and a liquid outlet of the chemical nickel mother liquor collecting tank is communicated with a liquid inlet of the nickel removal electrolytic tank; the nickel removing filter press is a stacked spiral filter press, and the phosphorus removing filter press is a plate-and-frame filter press.
3. The chemical nickel wastewater treatment system according to claim 1, characterized in that: the treatment system further comprises a flushing device for flushing the sand filter tank.
4. The chemical nickel wastewater treatment system according to claim 3, characterized in that: the sand filter tank is provided with a flushing inlet and a flushing outlet; the flushing device comprises a water inlet pipe communicated with a flushing inlet of the sand filter tank and a water inlet control valve arranged on the water inlet pipe; the device comprises a sand filter tank, a pH adjusting tank, a phosphorus removal reaction eduction tank, a pH adjusting tank, a sand filter tank, a first waste liquid control tank, a second waste liquid control tank and a nickel removal chelate resin tank, wherein a flushing outlet of the sand filter tank is communicated with a water inlet of the phosphorus removal reaction eduction tank, a flushing waste water control valve is arranged between the sand filter tank and the phosphorus removal reaction eduction tank, a first waste liquid control valve is arranged between the pH adjusting tank and the sand filter tank, and a second waste.
5. The chemical nickel wastewater treatment system according to claim 1, characterized in that: the nickel removal chelate resin tank is provided with a regeneration liquid inlet and a regeneration liquid outlet; the treatment system also comprises a resin regeneration device communicated with the regeneration liquid inlet of the nickel-removing chelate resin tank and a regeneration waste liquid recovery device communicated with the regeneration liquid outlet of the nickel-removing chelate resin tank.
6. The chemical nickel wastewater treatment system according to claim 5, characterized in that: the resin regeneration device comprises a regeneration liquid inlet pipe communicated with a regeneration liquid inlet of the nickel-removing chelate resin tank and a regeneration liquid control valve arranged on the regeneration liquid inlet pipe; remove and be provided with regeneration waste liquid control valve between nickel chelate resin jar and the regeneration waste liquid recovery unit, sand filtration jar with remove and be provided with first waste liquid operating valve between the nickel chelate resin jar, remove and be provided with second waste liquid operating valve between nickel chelate resin jar and the dephosphorization reaction precipitation pond.
7. The chemical nickel wastewater treatment system according to claim 6, characterized in that: the regeneration waste liquid recovery device comprises a regeneration waste liquid storage tank, a nickel-removing reaction separation tank and a nickel-removing sedimentation tank which are sequentially communicated, wherein a regeneration waste liquid control valve is arranged between the nickel-removing chelate resin tank and the regeneration waste liquid storage tank, and a liquid outlet of the nickel-removing sedimentation tank is communicated with a liquid inlet of the waste liquid collection tank.
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| CN110467293A (en) * | 2019-08-28 | 2019-11-19 | 东莞市科达环保工程有限公司 | A kind of processing method and processing system of chemistry nickel waste water |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110467293A (en) * | 2019-08-28 | 2019-11-19 | 东莞市科达环保工程有限公司 | A kind of processing method and processing system of chemistry nickel waste water |
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